题型:判断题 During ______ Middle Ages, the main aim of painters was to represent ______ religious themes. [ ]A. the; the B. 不填; the C. the; 不填 D.不填; 不填 查看答案
题型:判断题 已知函数f(x)=logax(0<a<1)对下列命题:①若0<x<1,则f(x)>0②若x>1,则0<f(x)<1③若f(x1)>f(x2),则x1<x2④对任意正数x,y都有f(x•y)=f(x)+f(y)其中正确的有( )A.4个B.3个C.2个D.1个 查看答案